KEEN size small 100% cotton slim fit grey unisex youth tee shirt back to school

Suitable for slim youth. Fit my son between 10-12 years, but he is tall with an athletic build (skinny). Labeled size small. Unsure if it was originally men’s small. Would fit a youth large. Recess Is Back! 100% cotton. Grey in colour. Back to school… this would be a perfect shirt!!